Why didn't Myst have a larger impact? The answer is in the article:
Much of the game's popularity was thanks to casual players who found themselves drawn to its evocative, violence-free world; many hard-core gamers found it obtuse and frustrating, its point-and-click interface slideshow-esque and stifling. Maybe Myst wasn't for hard-core gamers. Maybe it wasn't even really a game.
It also explains the distinction and the draw:
I was about 11 when I landed on the island for the first time — a couple years late; CD-ROM technology took a few years to come to our house. NES and Sega were more or less verboten throughout my childhood. That didn't stop me from playing hours of Zelda at my friends' houses, but because I didn't have nearly as much time to practice getting "good" at console games, I remember having a bit of anxiety about navigating a virtual world, feeling painfully inept in comparison with my friends, for whom a controller felt as natural in their hands as a no. 2 pencil. But now, here I was in a world where video game aptitude was irrelevant: rather than a mastery of timing and hand-eye coordination (ah, remember that old argument to get your parents to buy you a Nintendo? "It'll improve my hand-eye coordination, Mom!"), Myst required little more than your eyes, your ears, and a healthy sense of curiosity.
To that I would add that the pre-rendered graphics looked much nicer than most other games available at the time.
I was a gamer when Myst came out. I remember it being sneered at by the hardcore crowd. The people talking about it changing the face of gaming were the ones salivating over its sales figures. But casual games don't seem to create new genres so easily. For a while it was Myst, then it was The Sims, then Angry Birds, Farmville, Plants vs. Zombies, and who knows what else. And they're all different! Whatever makes a casual game popular, it doesn't seem to be easy to clone. At a guess, I'd say it's personality.
(Why did we sneer at Myst? Because every gaming executive secretly wants their company to be a casual gaming money machine. When they start talking about "the future of gaming" being being point-and-click slideshows, it sounds very threatening to us. The modern version of this is "the future of gaming is mobile", i.e. games with a terrible touchscreen interface. But since gaming happens across so many different platforms now, it's less scary. Plus, we're older, so we've seen this pattern a few times.)
(Also, I was 12, so I sneered at everything.)